can't advise on which is better
but we went with the long term warranty from Sun Kool, who installed our Trane unit. Have had several problems with the unit, but none with Sun Kool - have had work on garage unit and on outside condenser at no charge for labor or parts, except for one "blockage" on garage unit that was not convered by warranty. Latest (April) was an evaporator coil on the outside condenser. Would have been $400 plus per Sun Kool without the warranty.
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